Weathering and Erosion
Grade 4 - Science - Building Confidence
NameDate
Observation: dry sand moved farther when the fan speed increased. Which explanation fits?
- water eroded the steep slope faster
- ice weathered the rock by expanding
- waves eroded the shoreline
- stronger wind caused more erosion
Which agent caused the change in this observation: water froze in a crack and widened it?
- waves
- ice
- gravity and rain
- wind
Which setup would likely erode faster?
- a sealed rock kept dry indoors
- shoreline hit by many waves
- a protected surface with no moving material
- protected shore with plants
Which solution could slow this process caused by ice?
- plant roots can hold soil in place
- sealing cracks can reduce water entering them
- covering soil with plants can slow wind erosion
- dune grass can help hold beach sand
Which comparison gives useful evidence about weathering or erosion?
- a slope label compared with another label but no observation
- rock with water freezing in cracks compared with dry rock with no cracks
- two trays with the same conditions but no sediment measured
- rock color before and after with no force or movement tested
Observation: water froze in a crack and widened it. Which explanation fits?
- stronger wind caused more erosion
- water eroded the steep slope faster
- ice weathered the rock by expanding
- water and gravity moved sediment downhill
Which agent caused the change in this observation: more sand washed from the steep tray than the flat tray?
- ice
- running water
- gravity and rain
- wind
Which setup would likely erode faster?
- a sealed rock kept dry indoors
- dry bare sand with strong wind
- a protected surface with no moving material
- damp sand with grass
Which solution could slow this process caused by waves?
- dune grass can help hold beach sand
- plant roots can hold soil in place
- make the slope steeper and bare
- terraces can slow soil movement on slopes
Which comparison gives useful evidence about weathering or erosion?
- rock color before and after with no force or movement tested
- dry bare sand with strong wind compared with damp sand with grass
- two trays with the same conditions but no sediment measured
- a slope label compared with another label but no observation